Callousness
Part of speech: noun
Definition: The quality of being callous; emotional hardheartedness or indifference.
Hardness
Part of speech: noun
Definition: The quality of being hard.An instance of this quality; hardship.
Example sentence: The work of art, just like any fragment of human life considered in its deepest meaning, seems to me devoid of value if it does not offer the hardness, the rigidity, the regularity, the luster on every interior and exterior facet, of the crystal.